Universal cord-circuit for telephone systems.



C. S. WINSTON.

UNIVERSAL CORD CIRCUIT FOR TELEPHONE SYSTEMS.

' APPLICATION FILED SEPT-20,1913. LELWZUE Patented Sept. 5, 1916.,

provision of means whereby when connec- CHARLES s. WINs'roN, or oHIcAGo,;-ILLINoIs, ASSIGNOR T0 KELLOGG swrronnoann Ann-SUPPLY COMPANY, or CHICAGO, ILLIN Is, A CORPORATION or ILLINOIS.

UNIVERSAL CORD-CIRCUIT FOR TELEPHONE SYSTEMS.

' To all whom it may concern:

Be itknown that I, CHARLES S. WINSTON, a citizen of the United States of America, residing in Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Universal Cord-Circuits for Telephone Systems, of which the following is a specification.

In general my invention relates to operators cord circuits and is dir'ectedgnore particularly 'to so-called universal cordcircuits which are adapted for interconnecting telephone lines of different characters, such as magneto and common battery lines.

One ofthe features of my invention is the tion made between lines of one character as between two common battery lines, automatic connection and disconnection of the operators circuit is provided giving sof called secret service, but when connection is made to a called line of a different character such as a magneto or local battery line,

\ although again the automatic connection and disconnection of the operators 'telephone is provided, nevertheless the operator is enabled tolisten' in by the actuation of a manually operated listening key.

In the accompanying drawing I have illustrated a telephone system embodying my invention and I have shown only sufficient apparatus to disclose the operation of iithe system.

Referring now more in general to the arrangement illustrated, I have provided a common battery calling substation A, connected by ineans of line conductors l and 2 to a line circuit B terminating at a multiple switchboard in multiply connected jacks, 3.

Said line circuit B also includes a line relay LR and cut-off relay CO, To the right of the drawing is shown a common battery substationCconnected by means of conductors at, 5 to a line circuit D at the central ofi ice" comprising multiply connected jacks 6, line relay -LR1 and cutoff relay Q0 A socalled local battery or -magneto telephone line signal in the form of a drop 10.

A cord circuit F is provided which is of universal character in that connection may Specification of Iletter s Patent.

be made between the two common battery substationsA, C, or between substation A and local battery ormagneto substation E.

Patented Sept. 5,1'916, I Application filed September 20, 1913. Serial No. 790,821.

dium of the windings of the repeating coil 13. I An answering supervisory relay AS is also provided, being connected in bridge of the answering tip and sleeve conductors and in circuit with a central source of battery. A switching relaySW is also provided and adapted to be energized when the answering plug 11 is inserted in a calling common battery line, relays AS and SW'being adapted nal 1st. Relay SW also serves to connect the operators telephone 0 in circuit with the calling line, when energized.

.to control the answering supervisory slging relay SW which is energized when the calling plug 12 is inserted into the jack of a common battery line. When the plug 12 is inserted into the jack of a magneto or local battery line, switching relay STU does not operate and therefore calling supervisory relay CS is not connected in circuit, but as above referred-to, when connection is made to a common battery line, relay. SW energizes to connect calling supervisory relay CS in circuit and it is by these two relays CS and SW that the calling supervisory signal 15 is controlled. When connection is made with a magneto line, su-

pervision is also provided in the nature of a .drop 16 wh1ch 1s adapted to remain con nected across the tip and sleeve conductors by thenon-operation .of the switching relay SW so that when disconnection is desired themagneto subscriber operates the drop 16 by current from the hand generator at the substation. I 1

Now'as to the control of the operators telephone at the calling end ofthe cord circuit, when connection is made with a common battery line, relay SW is energized as already refierred to and therefore disconnects the operators telephone 0 from the answering endof the cord circuit and it is impossible for the operator to listen in nect relay OD is operated to disconnectthe operators telephone. Nevertheless should the operator desire to listen in on a connection to the called magneto line, a listening key LK is provided whereby her telephone 0 may be connected in cireuitwith the cord F. This latter connection is desirable where magneto lines are connected with, because such lines are frequently used as toll lines and for this reason the operator usually must be able to converse with the called subscriber or due to the fact that a subscriber at a magneto substation will frequently fail to operate the drop 16 for disconnect purposes, the operator may listen in to ascertain whether the conversation is finished.

In connection with the embodiment of my invention illustrated,,I have provided party line ringing apparatus together with automatic ringing control or manual ringing control, either one of which controls may be provided according to the operation of the switch S. This convertible automatic and manual ringing apparatus is preferably provided for the ringing of the common battery lines only, although it is to be understood that my invention is not limited to this particular arrangement in connection with this ringing apparatus. A four party ringing key PK is provided associated with generators of different frequencies such as the generators 18, 19, 20, 21 which may be connected in circuit by the independently operable key contacts 22, 23, 24 and 25 respectively. A common set of contacts 26, 27, .are operated when any of the ringing plungers is fully depressed, but when the plunge-rs return to indicating position these common contacts restore to normak I preferably arrange to apply the ringing current intermittently through an interrupterrelay IR when the automatic rlnglng is connected in circuit, which ringing. current is mamtained connected to the called line until a response 1s secured at which time the rlng- 'ing disconnect relay RD is deenergized torender the interrupter relay IR inert.

At times it is desirable to use manual ringing, such as during'the night when few calls are made, and therefore by the use of a switch S, the automatic ringing control is removed and manual ringing control applied. When switch S is in its upper position' MA, manual ringing is provided and when said switch is in its lower position AU, automatic ringing is provided.

Having described in general the characteristics of the preferred embodiment of my invention, itsoperation in establishing connection between lines will now be described.

Assuming that a connection is' to be established between a common battery substation A and a magneto substation E, upon removal of the receiver at substation A, a circuit for its line relay is established Over the calling line 'whereb'y LR is energized to operate the line signal 29. The operator in response to this signal inserts an answering plug 11 into the answering ']1Cl 3 of'the calling line whereby relay AS relays CO and SIV are connected in series through the third contacts of the jack and plug whereby said relays are energized, relay CO disconnecting line relay LR. Responsive to energization of SW, its alternate contact 30 is closed but due to the fact that normal contact 31 vof AS is interrupted answering supervisory signal 14 is not lighted. Should the subscriber at A desire to signal the operator, by operating his switch-hook and thus interrupting the circuit of AS, the'normal contact 31 is closed and signal 14. lighted. Also responsive to the energization of SlV, operators telephone 0 is connected in circuit with cord F through alternate contact 32, 33, normal. contacts 34, 35 of OD and normal contacts 3G, 37 of SIV Thus the operators telephone 0 is automatically connected in circuit with the calling substation A and the operator finding that connection is desired with a magneto or local battery substation E, will insert the calling plug 12 into the jack 9 thereof. In this instance the switching relay SIV does not operate because no circuit is provided through the third con tact of the plug. The operator now actuates ringing key RK thus connecting the ringing generator G across the terminals of the called line thereby ringing the callbell at substation E. Also responsive to the operation of the ringing key, its alternate contact 39 is closed establishing an energizing circuit for the operators circuit lliS tOI1- nect relay OD, which relay locks itself through its alternate contact 40 to ground at alternate contact 30 over conductor 4-1.. Relay OI) therefore interrupts its normal contacts 34-, 35 thus disconnectin conducy '1 erators telephone from the cord circuit. It will -.be seen from this that the operators telephone -.is automatically connected and disconnected from the cord circuit. But as already pointed out when connection, is ,made with a called magneto line. the opera tor may again out her telephone in cir- 16 remains bridged across the cord circuit so thatwhen the subscribers have finished their conversation, an operation of the hand generator at substation E is effective to operate drop 16 while the replacing of the receiver at substation A is: eflective to interrupt the circuit of relay AS causin its denergization. gTherefore its norma contact 31 is closed and a circuit for lamp 14 is established through alternate contact. 30. The operator in response to these signals withdraws the plugs 11 and 12 fromthe springjacks, the disconnection of answering plug '11 being effective to restore relay SW.

whereby'its contact 30 is interrupted effacing signal 14 and'interrupting the locking circuit for relay OD which also restores.

Assuming now that plug 11 has been inserted into jack 3 in response to a call from substation A, whereby operators telephone 0 is connected in circuit as before and that connection is to be made to a called common battery substation C. Therefore the operator inserts the plug 12 into a jack 6 of the called line whereby switching relay SW and cut-off relay C0 are connected in series over the thirdcontacts. of plug 12 and jack 6 causing the energization of these relays. Responsive'to the energization of SW its normal contacts 36, 37 are interrupted whereby the connection from the operators telephone through conductors 42, 43, is in terrupted, thereby automatically disconnecting the operators telephone. Due to ,the fact that relay SVV remains energized as long as the plug 12 is in the jack 6, the operators telephone 0 remains .disassociated from cord circuit F, and furthermore, even should the listening key LK be operated, thetelephone cannot be connected to the cord circuit dueto the interruption of normal contacts 36, 37. The operator now actuates the proper party line ringing key PK, and assuming that the switch S is in battery. 3 Relay RDtherefore interrupts its normal contact 53 so that when the operator releases her hold upon the actuated ringing therefore established from ground at nor:

mal contact '48 of CS, alternate'contacts 49, 53, the winding of IR, contact54 and interrupter 55 to battery. Relay IR is therefore alternately energized and denergized, each its automatic ringing position AU, upon interruption of the common contact 27 of key PK, the short circuit around the winding of ringing disconnect relay RD is interrupted wherebv circuit for RD is established from ground at normal contact 48 of relay CS, alternate contact 49, the winding of RD, conductor 50, resistance 51- and contact 52 to energization thereof being effective to close its alternate contacts 56, 57 and thereby con nectingringing current to the terminals of the calling line whereby the call-bell at the proper substation is operated. -Upon each decnergization of IR, and due to the clos ing of its normal contacts 56, 57, theisupervisory relay CS is connected in bridge of the cord circuit conductors but due to the condenser at substation C, relay CS does not operate as long as the receiver is on its switch-hook. Upon removing the receiver at substation C in response to the call, and upon the following deenergization of relay IR, a circuit for CS is established from ground through the upper winding thereof, alternate contact 36, normal contact 56, tip contacts of plug and jack, over the line and through substation C returning over the sleeve contacts of jack and plug, normal contact 57, alternate contact 37 and the lower winding of OS to battery. Relay CS therefore energizes interrupting the circuit of lamp 15 at its. contact 58, which circuit was previously established through alternate contact 59 of SW. Responsive to interruption of normal contact 48 of CS, the circuit for ringing disconnect relay RD is interrupted causing the restoration of RD and thereby rendering relay IR. inert.

After the subscribers at substations A and C have finished their conversation, they replace their receivers upon their respective switch-hooks thereby interrupting the circuits for supervisory.relays AS and CS. Relay AS therefore restores closing its normal contact 31 andestablishing a circuit for signal 14 While relay CS restores closing its normal contact 58 and establishing a circuit for signal 15. The. operator in response to these signals removes plugs 11, 12 from jacks 3,6, whereby all apparatus is restored to normal.

Assuming now that a connection'has been established between substations A and C and theswitch S is in its manual ringing position MA, upon the operator depressing a plunger of party line key PK, although common contact 27 is interrupted relay RD does not energize because of the ground connection to both ends of its winding. But upon the closing of ground to alternate con tact 26 ofthe ringing key, a circuit for relay IR is established through contact (31 of switch S battery; 'Therefore each actuation otkey'PK etl'ects an operation of relay IR whereby ringing current is connected through alternate contacts 56, 57, to the calling' line. lVhen the subscriber at C re{ sponds, relay CS energizes asbefore, efiacing signal 15. After the subscribers have finished their conversation they will restore thein'receivers operating relays AS and CS a'stbeforeand bring about the Operation of the (lisconnect'signals so that the operator may knowdisconnection is desiredl It will be apparent that manyv changes and modifications of the system will readily occur to those skilled in the art and it is to v be understood that I contemplate applying my invention in other ways than in the embodiment disclosed, and therefore I do not desire to be limited to the exact structure as shown and described but aim to cover all that which comes within the spirit aild scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is; p

1. A universal cord circuit for telephone systems, comprising inductively united answering and calling ends, an operators telephone, aswitching relayassociated with the answering end for connecting said operators telephone in talking circuit with .the cord, means whereby the calling end of the cord circuit may be used for connection to telephone lines of different characters, an operators disconnect relay effective to disconnect said operators telephone when the calling end is connected with the telephone line of one character,'and a switching relay adapted for disconnecting said operators telephone when the calling end of the cord circuit is used in connection with a telephone line' of a different character.

2. A telephone system comprising telephone lines of different characters including common battery and. local battery lines, a

universal cord circ it for interconnecting said lines, an operators telephone, means I responsive to the connection of said cord connection of said cord to any one of said lines as called lines for automatically disconnecting said operators telephone, and means operative only when said cord is 0on1 nected to a called line of one of said characters whereby said operators telephone may again be connected to said cord circuit.

4. A telephone system comprising tele phone lines of different characters including common battery and local. battery lines, a universal cord circuit for interconnecting said lines, an operators telephone, means responsive to the connection of said cord circuit with a calling one of said lines to automatically connect said telephone with said cord circuit, means responsive to the connection of said cord to any one of said lines as called lines for automatically discon-. necting said operators telephone, an operators key, and circuit connections controlled thereby and effective only when said. cord circuit is connected to a called line of one 01 said characters to again connect said opcr: tors telephone to the cord circuit.

5. A telephone system comprising local and common battery telephone lines, line cir-' cuits of different characters for said lines, a universal cord circuit for interconnecting said lines, an operators telephone, means responsive to the connection of said cord circuit with a line circuit of a calling one of said lines to autmnatically connect said telephone'with said cord circuit, and means whereby when connection is made to a line circuit of either character of said lines as called lines for automatically disconnecting said operators telephone.

6. telephone system comprising local andcOmmon battery telephone lines, line circuits of correspondingly dilterent characters for said lines, auniversal cord circuit for interconnecting said lines, an operators telephone, means responsive to the connection of said cord circuit with aline circuit of a calling one of said lines to automatically connect said telephone withsaid cord circuit, means whereby when connection is made to a line circuit of either character of said lines as called lines for automatically disconnecting said operators telephone, and means operative only when said cord is connected with a line circuit of one of said characters whereby said operators telephone may again be connected to said cord circuit.

7. A telephone system comprising local and common battery telephone lines, line circuits of diflerent characters for said lines, a universal cord circuit for interconnecting said lines, an operators telephone, means responsive to connection of said cord circuit with a calling one of said lines to automatically connect said telephone with said cord circuit, means responsive to the connection of said cord to the line circuit of any of said lines as called lines for automatically disconnecting said operators telecuits :an erators tele hone means res on-- phone, an operators key, and: circuit connections controlled thereby and effective only when'said cord circuit is connected to a line circuit of one of said gharacters-to again connect said operators telephone to the cord circuit. v

8. A telephone system comprising common battery and local battery telephone lines, line circuits of different characters for said.lines,"a universal cord circuit for inter- A connecting said lines through said line cirsive to, the connection-'01": said cordcircuit with the line circuit of a calling one of said lines to automatically connect saidtelephone with said cordcircuit, and means responsive to the connection of sand COIClClICllll] to'-'a line circuit of any of said lines as called lines to automatically disconnect said operators telephone.

"9. A telephone system comprising telephone lines, a cord circuit for interconnecting said lines, an operators telephone, a

ringing key for saidcord circuit, a switch relay responsive to the connection of said cord to a calling one of said lines to connect said telephone in circuit with.the cord, an

tion of said cord circuit with a calling one ofsaid lines to automatically connect said telephone with'said cord circuit, and means for automatically disconnecting the said operators telephone when a connection is established between said circuit and any one of said lines as called lines.

11-. A telephone system comprising telephone lines' of difierent characters includ ing local battery and common'battery lines,-

a cord circuit for interconnecting said lines, an operators telephone set, means responsiveto the connection of said cord circuit with a calling one of said lines to automatically connect said telephone set with said cord circuit, means for automatically disconnecting the said operators telephone set when connection is established between the said cord circuit and any one of said lines as called lines, and means operative when said cord is connected to called lines of one of said characters whereby said operators telephone set may again be connected to said cord circuit.

12. A telephone system comprising-local and common battery lines, line circuits that correspond to the diiierent characters for said lines, a universal cord circuit for interconnecting said lines, an operators telelines of different characters including common battery and local battery lines, a cordv circuit for interconnecting the said lines, said cord circuit including a switching relay and a disconnect relay, an operators telephone set, means for. automatically connecting the said operators telephone set to the said cord circuit when connection is established between the cord circuit and a calling one of said lines, means for energizing the said switching relay to disconnect the said telephone set from the said cord circuit if connection is established between the said cord circuit and one of said common battery lines as a called line, and

"means for energizing the said disconnect relay to disconnect the operators telephone; set from the said cord c1rcu1t if'connection is established between the said cord circuit and one of the said local battery telephone lines as a called line.

14; In a telephone system, subscribers" operators telephone, means for automatically connecting the said telephone to the said cord circuit when connection is established between the said cord circuit and a calling one of said lines, means for automatically disconnecting the said operators telephone when connection isestablished between the said cord circuit and. one of said lines as a called line, and means for operating the said ringer-relay either automatically or manually tov signal the said called subscriber.

15. A telephone system comprising local battery and common battery subscribers telephone lines, a universal link circuit for interconnecting said lines, an operators' telephone, and electromagnetic means for automatically connecting and disconnecting said operators telephone with said link circuit.

16. A telephone system comprising common battery and local battery telephone lines, a universallink circuit for interconnecting said lines, an operators telephone, means for automatically connccjtingand disllt for interconnecting said lines, an operators telephone, and relays for automatically connecting and disconnecting said operators telephone and said link circuit. i

19. A telephone system including tele phone lines, a link circuit for connecting said lines in conversational circuit, an operators telephone, ringing apparatus for said link circuit, a relay responsive to the connection of said link circuit to a calling one of said lines to connect said telephone in circuit'with the link circuit, means for connecting the link circuit to a called one of said lines, a key for connecting said ringing apparatus to said called line to operate the call bell at the called substation, and a relay responsive to an Operation oi said key to disconnect said telephone from said link circuit.

20. A telephonesystem including a calling subscribers line and a called subscriber's line, a link circuit for establishing eonneetion between said lines, automatic ringing apparatus associated with said link circuit for signaling the called substation, an operators telephone, a relay responsive to a connection of said link circuit to said ealling line for connecting said telephone with said link circuit, a ringing key tor eonneeting said ringing apparatus to the called line, and a relay responsive to an initial op eration of said key to automatically disconnect said telephone troni said link circuit.

Signed by me at (,hicago, county of (ook and State of Illinois, in the presence ot' two witnesses.

CHARLES S. WINSTON.

Witnesses Guonon E. MUELLER,

M. R. Roonronn. 

